[Bug]: Vega number locale should be consistent with Kibana's format:number:Locale

[bphenriques]

Hello,

By default Vega uses American English Locale (https://vega.github.io/vega/docs/api/locale/), however it would be great if that Locale would be consistent with Kibana (format:number:Locale in advanced settings - source) when using "formatType": "number".

Steps to reproduce:

• Set format:number:Locale to pt-pt (uses €)
• Create the following Vega visualization:

{
  "$schema": "https://vega.github.io/schema/vega/v3.3.1.json",

  "data": [
    {
      "name": "table",
      "values": [
        {"category": "A", "amount": 2800.32},
        {"category": "B", "amount": 5500.54},
        {"category": "C", "amount": 4300.12}
      ]
    }
  ],
  "scales": [
    {
      "name": "xscale",
      "type": "band",
      "domain": {"data": "table", "field": "category"},
      "range": "width",
      "padding": 0.05,
      "round": true
    },
    {
      "name": "yscale",
      "domain": {"data": "table", "field": "amount"},
      "nice": true,
      "range": "height"
    }
  ],

  "axes": [
    { "orient": "bottom", "scale": "xscale" },
    { "orient": "left", "scale": "yscale", "formatType": "number", "format": "$.3s" }
  ],

  "marks": [
    {
      "type": "rect",
      "from": {"data":"table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "category"},
          "width": {"scale": "xscale", "band": 1},
          "y": {"scale": "yscale", "field": "amount"},
          "y2": {"scale": "yscale", "value": 0}
        },
        "update": {
          "fill": {"value": "steelblue"}
        }
      }
    }
  ]
}

Expected results: The currency sign should be € and not $:

Regards,
Bruno

[marcopesani]

+1